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I'm looking to find demographic information on certain keywords. Is there a tool that does this?

I have 2 sites hosted with Blue Host and was told to put the robots.txt in the root folder and just use the one robots.txt for both sites. Is this right? It seems wrong. I want to block certain things on one site. Thanks for the help, Rena

In Webmaster Tools I have a ton of pages listed under Structured Data  >> Hentry.  These pages are not on my website and I don't know where they are coming from. I redid the site for someone and perhaps they are from the old site. How do I find and delete these? Thank you Rena

I keep getting crawl errors for urls that have email addresses on the end. I have no idea what these are. Here is an example: the-audio-visual-system/sales@intercallsystems.com Where would these be coming from, how are they created? How can i fix them? When I try to do a 301 redirect it doesn't work. Thanks for your help,
Rena

How do I set up these sites so that they will not be negatively affecting their SEO efforts? I have 2 businesses with the  same owner. Business A manufactures nurse call systems and Business B installs them. They are run separately with two websites. The content is very similar because the business that installs them describes the different products on their website. These are the two sites: intercallsystems.com and nursecallny.com , My thought was on nursecallny.com when you click on the nav link "Nurse Call Systems" you would be directed to the intercell website. Would this be the best method? Thank you for your  help!